Description
HI PLAST – R is a Chloride free dark brown liquid based on selected lignosulphonates. When added to concrete mixes the admixture is absorbed onto the cement particles and acts as a dispersing agent which breaks down agglomerates of cement particles and enables the water in the mix to perform more efficiently. It delays the initial hydration of the cement which results in retardation of the setting time. However, once the concrete has undergone initial set, the hardening process continues normally.
USES
Hi Plast-R is used wherever a delay in setting time will insure sufficient delivery, placement, vibration or compaction time, such as in: • Hot weather concreting, • Transit mix concrete • Prestressed concrete.
ADVANTAGES
Increased workability and extended setting times minimises risks associated with long distance deliveries in hot weather.
Improves workability, cohesion and extends setting time.
Increases compressive strengths and reduces permeability.
Avoidance of ‘cold joints’, helps easy casing removal.
Delays time of set to accommodate long haul times, or facilitate placement and finishing during
hot weather concreting.
Higher strengths without increase in cement content or reduction in workability.
PACKING
Hi Plast-R is available in 250 HDPE Barrels.
TECHNICAL DATA
Appearance : Brown liquid
Form : Liquid dispersion
Specific Gravity : 1.16 ± 0.02
Chloride Content : Nil
DIRECTIONS
Surface preparation
Dosage
The dosage varies upon the desired effect, the cementitious material (quantity, type, and source), concrete and ambient temperatures. Normally Hi Plast-R will be added at a rate between 0.1 to 0.4lt/50 kg of cement depending on the slump and retardation required. Longer setting times or higher temperatures will require higher addition rates. Site trials should be carried out to determine optimum dosage.
Dispensing
The correct quantity of Hi Plast-R should be measured by means of an accurate and recommended dispenser. The measured quantity of the admixture should be added directly to the mixer at the same time as the mixing water. If mixing water is added in more than one stage, add Hi Plast-R in the last stage.
Curing
Efficient concrete curing is essential and is best achieved by use of Hi Cure spray applied curing compound. If traditional methods such as water spray or wet hessian are used, they must be carried out thoroughly.
SHEL LIFE
1 year in original, unopened container.
SAFETY
During use, avoid contact with the skin and eyes. Wear protective gloves and eye protection when handling the product. In case of contact with the eyes rinse with plenty of fresh water and seek medical advice.
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